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Forced convection adsorption cycles.

Author(s) : CRITOPH R. E.

Type of article: Article

Summary

The convective thermal wave is part of a patented cycle which uses heat tansfer intensification to achieve both high efficiency and small size from a solid adsorption cycle. Such cycles normally suffer from low power density because of poor heat transfer through the adsorbent bed. Rather than attempting to heat the bed directly, it is possible to heat the refrigerant gas outside the bed and to circulate it through the bed in order to heat the sorbent. The high surface area of the grains leads to very effective heat transfer with only low levels of parasitic power needed for pumping. The cycle presented here also uses a packed bed of inert material to store heat between the adsorption and desorption phases of the cycle. Thermodynamic modelling, based on measured heat transfer and porosity data, predicts a cycle COP (for a specific carbon) of 0.95 when evaporating at 0 deg C and condensing at 42 deg C. A research project to build a 10-kilowatt water chiller is underway. The laboratory system is described.

Details

  • Original title: Forced convection adsorption cycles.
  • Record ID : 1999-1562
  • Languages: English
  • Source: Applied Thermal Engineering - vol. 18 - n. 9-10
  • Publication date: 1998/09

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